World War I soldiers created underground art in the trenches. - 2
Published 11 Nov 2018, 08:28 GMT
Training at Quantico, Virginia before deployment, United States Marines practice attacking and defending trenches.
Photograph by National Geographic
Sitting patiently in a French trench, an American WWI soldier pens a letter home.
Photograph by National Geographic
An Italian soldier crouches in a fully enclosed World War I snow trench.
Photograph by National Geographic
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